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| Q. |
How do Laser printers work? |
| A. |
The laser printer was introduced by Hewlett-Packard in 1984. Laser printers work in a similar way to a photocopier, the difference being the light source. In a photocopier and scanner, a page is scanned with a bright light, while with a laser printer the light source is a laser - this is where the name 'Laser printer' was formed. After the scanning process it is much the same as a photocopier, with the light creating an electrostatic image of the page on a charged photoreceptor or drum, which in turn attracts toner in the shape of an electrostatic charge.
Laser printers produce much better quality black text documents than inkjet printers and laser printers are more economical than inkjet printers, with many producing many more print outs before needing a new toner cartridge.
Most laser printers use toner cartridge technology based on an organic photoconductive (OPC) drum, coated in light-sensitive material.
During the lifetime of the laser printer, the light sensitive drum needs to be periodically replaced as its surface wears out and print quality deteriorates. The toner cartridge is the main consumable item in a laser printer. Sometimes the toner cartridge and the OPC drum are housed separately, but in the worst case, the drum is located inside the cartridge. This means that when the toner runs out, the whole drum containing the OPC cartridge needs to be replaced, which adds considerably to the running costs of the printer and produces large amounts of waste. |
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